diff --git a/scripts/prepare_sector_network.py b/scripts/prepare_sector_network.py
index 7baffc83..7903921c 100644
--- a/scripts/prepare_sector_network.py
+++ b/scripts/prepare_sector_network.py
@@ -385,7 +385,7 @@ def add_carrier_buses(n, carrier, nodes=None):
 
     n.add("Carrier", carrier)
 
-    unit="MWh_LHV" if carrier=="gas" else "MWH_th"
+    unit = "MWh_LHV" if carrier == "gas" else "MWh_th"
 
     n.madd("Bus",
         nodes,